package com.ots.project.tool.exam;
import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.codec.binary.Hex;
import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class DecryptUtil {
	public static byte[] AES_CBC_Decrypt(byte[] data, byte[] key, byte[] iv) throws Exception{
		Cipher cipher = getCipher(Cipher.DECRYPT_MODE, key, iv);
		return cipher.doFinal(data);
	}
	private static Cipher getCipher(int mode, byte[] key, byte[] iv) throws Exception{
		Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
		
		
		SecretKeySpec secretKeySpec = new SecretKeySpec(key, "AES");
		cipher.init(mode, secretKeySpec, new IvParameterSpec(iv));
		return cipher;
	}
	public static void main(String[] args) throws Exception {
		
		
		byte[] bytes = "db2139561c9fe068".getBytes();
		String base64Str = Base64.encodeBase64String(bytes);
		System.out.println(base64Str);
		String crypto = "34439a96e68b129093105b67de81c0fc";
		byte[] data = Hex.decodeHex(crypto.toCharArray());
		byte[] s = AES_CBC_Decrypt(data, bytes, bytes);
		System.out.println(new String(s));
	}
}